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Asymmetric Catalytic 1,3-Dipolar Cycloaddition Reaction of Nitrile Imines for the Synthesis of Chiral Spiro-Pyrazoline-Oxindoles

✍ Scribed by Wang, Gang; Liu, Xiaohua; Huang, Tianyu; Kuang, Yulong; Lin, Lili; Feng, Xiaoming

Book ID: 120278620
Publisher: American Chemical Society
Year: 2012
Tongue: English
Weight: 430 KB
Volume: 15
Category: Article
ISSN: 1523-7060
DOI: 10.1021/ol303097j

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## Abstract 1,3‐Dipolar cycloadditions of exocyclic α,β‐unsaturated ketones 1‐22 with diazomethane afforded spiro‐1‐pyrazolines 23‐44 in a diastereospecific reaction. The structure and stereochemistry of each compound synthesised has been elucidated by nmr spectroscopic measurements and other analy